Study of SM-MIMO system combining opporturustic scheduling with zero-forcing receivers

Abstract:

To utilize the multiuser diversity efficiently in multiuser MIMO systems, opportunistic scheduling is employed, where the user with largest SNR is adaptively selected according to channel state information feed- back from the receive side and in the meantime, and to utilize the multiplexing gain effectively and improve the capacity, a novel scheme of MIMO systems combining opportunistic scheduling and spatial multiplexing with zero-forcing receiver is presented under Rayleigh channel. Using the direct method based on polynomial expansion, the expressions of error rate with M-QAM and M-PSK modulations, the diversity gain and the sum- rate capacity under different channel conditions are got, respectively, and the asymptotic forms are derived based on Taylor series. The correctness of theoretical analysis is verified by the corresponding Monta-Carlo simulation results which indicate that the scheme with multiuser diversity provides much larger diversity and higher capacity than that without opportunistic scheduling